The Robins have paid a fee to bring the player to Moss Lane from Yorkshire.
Avenue released a statement saying: “The club would like to thank Conor and wish him the best with his move. Bradford (Park Avenue) would also like to thank Altrincham FC for their professional standards and business approach during these negotiations.”
For Altrincham it softens the blow of the departure of attacker James Poole, who is emigrating to Australia.
Poole works for Manchester City and has been given a great chance to work closely with the club they own, Melbourne City.
He was excellent last season for the Robins and manager Phil Parkinson knows the 29-year-old will be missed.
Parkinson told the club’s website: "I am sure that everyone involved with Altrincham will be very sad to see James depart but this is a great opportunity for him personally and one that it would have been very difficult to turn down.
“The belief that James showed in me to sign for Alty two years ago meant everything to me.
“I will always hold him in the highest regard for helping us lay the foundations of where we are today.”